Definitely this.Phelan is driving everyone out of Eileen's house so that he can isolate her and manipulate her (and Jason's money) to his heart's content. That's typical abuser behaviour.
Do we have any news on Lee? That seems like the only secret Billy has recently been ACTIVELY terrified of people finding out.
Also, I could be remembering incorrectly, but isn't this a different bishop than the one that Billy wanted to hide Sean from?